STPS745G Equivalent & Substitute Parts

Part Overview

The STPS745G is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 45 V DC reverse voltage and 7.5 A average rectified current in a D2PAK surface mount package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance and mechanical compatibility while offering active product status and continued availability.

Substiute Parts

STPS745G

STMicroelectronicsIn Stock: 2742STPS745G Datasheet

Current PartRFQ

MBRB745

SMC Diode SolutionsIn Stock: 3850MBRB745 Datasheet

DirectRFQ

VS-MBRB745-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 3556VS-MBRB745-M3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the STPS745G are qualified based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 45 V minimum
• Current - Average Rectified (Io): 7.5 A minimum
• Technology: Schottky diode
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 100 µA @ 45 V maximum

Mechanical Compatibility Criteria:

• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
• Mounting Type: Surface Mount
• Supplier Device Package: D2PAK or TO-263AB (D2PAK)

Compliance Requirements:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The following parts meet all substitution criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

MBRB745 (SMC Diode Solutions)

The MBRB745 is an active product offering direct electrical and mechanical equivalence to the STPS745G. All critical parameters—reverse voltage, average rectified current, forward voltage, recovery speed, and reverse leakage—are identical. The part is ROHS3 compliant and carries MSL 1 rating. The operating temperature range (-55°C to 150°C) is narrower than the original part's maximum junction temperature of 175°C; this difference must be evaluated against specific application thermal requirements. The part is supplied in Tape & Reel packaging, suitable for automated assembly processes. REACH status is listed as affected, requiring compliance verification for regulated substance content in supply chain applications.

VS-MBRB745-M3 (Vishay General Semiconductor - Diodes Division)

The VS-MBRB745-M3 is an active product meeting all electrical and mechanical substitution criteria. Forward voltage performance is superior at 570 mV @ 7.5 A compared to the original specification of 840 mV @ 15 A, indicating lower conduction losses in typical operating conditions. The operating temperature range (-65°C to 150°C) provides extended low-temperature performance. The part is ROHS3 compliant, MSL 1 rated, and carries REACH Unaffected status. Packaging is supplied in Tube format. Capacitance specification (400 pF @ 5V, 1MHz) is provided, supporting high-frequency circuit analysis.

Both substitute parts are suitable for direct replacement in applications where the STPS745G is specified, provided that thermal operating ranges and packaging requirements align with production and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MBRB745 and VS-MBRB745-M3 be used interchangeably with STPS745G?

A: Both parts meet the electrical and mechanical substitution criteria for the STPS745G. They share identical reverse voltage (45 V), average rectified current (7.5 A), recovery speed characteristics, and D2PAK package configuration. Selection between them depends on thermal operating range requirements, forward voltage performance needs, and packaging format compatibility with assembly processes.

Q: What is the significance of the forward voltage difference between MBRB745 and VS-MBRB745-M3?

A: MBRB745 specifies 840 mV @ 15 A, while VS-MBRB745-M3 specifies 570 mV @ 7.5 A. These measurements are taken at different current levels. The lower forward voltage of the Vishay part at its rated current indicates reduced power dissipation during normal operation, which may be advantageous in thermal-constrained applications.

Q: Are there packaging considerations when substituting these parts?

A: Yes. MBRB745 is supplied in Tape & Reel format, optimized for high-volume automated assembly. VS-MBRB745-M3 is supplied in Tube format, suitable for lower-volume or manual assembly processes. Packaging selection must align with production equipment and handling procedures.

Q: What compliance certifications apply to these substitute parts?

A: All three parts (STPS745G, MBRB745, and VS-MBRB745-M3) are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. STPS745G and VS-MBRB745-M3 are REACH Unaffected. MBRB745 is REACH Affected, requiring supply chain compliance documentation for applications subject to REACH regulations.

Q: How do operating temperature ranges affect part selection?

A: STPS745G specifies a maximum junction temperature of 175°C. MBRB745 operates from -55°C to 150°C, while VS-MBRB745-M3 operates from -65°C to 150°C. Applications requiring sustained operation above 150°C junction temperature cannot use these substitutes. Thermal analysis of the specific circuit application determines whether the lower maximum operating temperature is acceptable.

Q: Is the capacitance specification important for circuit design?

A: Capacitance values (400 pF @ 5V, 1MHz) are provided for MBRB745 and VS-MBRB745-M3 but not specified for STPS745G. In high-frequency switching applications, diode capacitance affects circuit performance. If the original design relied on specific capacitance characteristics, the provided values for substitute parts should be incorporated into circuit analysis.